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1  Using Arduino / Project Guidance / Re: [Video] Thats why i had so many questions !! Thanks , great people,great forum ! on: December 29, 2012, 11:03:05 am
so... since I didn't see the initial project. Ima assume that your LEDs are hypothetical sprinkler systems or lights for your possible fullsize greenhouse?

Yes , the blue leds are the sprinkler systems for 2 products.. e.x. Tomatoes an Cucumbers... Each one controled by a humidity/temperaute sensor... The red leds are heating system...
2  Using Arduino / Sensors / Sensor for measuring temperature in a plastic water pipe ? on: December 28, 2012, 08:41:28 am
Hello , i want to build a system for controling circulators and valves for a heating project in a house... I want to measure the temperature of water.

What do you recommend ? thanks !
3  Using Arduino / Project Guidance / [Video] Thats why i had so many questions !! Thanks , great people,great forum ! on: December 28, 2012, 08:30:41 am
Thank you all for answering to my questions ! This is the project i was working on.

Video :


Photos :
































Thanks for your time and your ideas !
4  Using Arduino / Programming Questions / SM5100B SMS - Do you have code to help me ? on: December 12, 2012, 08:22:39 am
Hello i have this shield https://www.sparkfun.com/products/9607 and i want to "read" the phone number of its received messages. I can send sms and make calls , but i want to list received sms and get the sender phone number in order to reply.

if someone used it in his project i would be grateful...

thanks !
5  Using Arduino / Programming Questions / Re: How to build a string from analogRead values on: December 10, 2012, 05:37:55 pm
Think about how this might help:
Code:
    number = number * 10 + value;

-br


how simple and great...

dhenry thank you too !
6  Using Arduino / Programming Questions / Re: How to build a string from analogRead values on: December 10, 2012, 05:26:43 pm
You have to decide if you wanted is 43 (a numerical value), or "43", a string of chars.


numeric value is the best for me !
7  Using Arduino / Programming Questions / How to build a string from analogRead values on: December 10, 2012, 05:21:42 pm
Hello , i want to work with an analog keypad , im getting values with analogRead and my code understands which key is pressed so i can store it at
Code:
int value = analogRead(1);
. Thats ok , now lets say that value has the value 4 , and the next value will be 3 , i want to construct 43 ... i think its not possible with int type , so i have to use String or char , right ?

Thanks
8  Using Arduino / General Electronics / Re: Is the GND pin required ? on: December 09, 2012, 04:35:37 pm
Quote
or it is happening automatically  when i insert the power jack as retrolefty said
Yes like retrolefty said.

If you are not going through the jack, say to the Vin, then you have to connect is separately like fungus said.

Thank you all of you , i'll go with the jack !
9  Using Arduino / General Electronics / Re: Is the GND pin required ? on: December 09, 2012, 02:44:05 pm
The only time it's dangerous is when you don't do that!

This means i have to wire GND pin to (-) , or it is happening automatically  when i insert the power jack as retrolefty said ? , No my wiring is as retrolefty said .

Thanks !
10  Using Arduino / General Electronics / Is the GND pin required ? on: December 09, 2012, 12:20:26 pm
Hello forum , another issue for me ! First of all I want to know if it is safe to connect external 12V power at my power jack and have the usb cable connected too. I know it automatically chooses the power supply , but is it safe/recommended ?

My main issue, the GND pin of arduino has to be connected to the (-) of my power supply as well as the rest sensors/devices ? or the external power supply (-) is enough at the jack barrel ? the power supply of arduino is the same as the power supply of sensors/devices. Its a atx power supply. Thanks !
11  Using Arduino / Sensors / Re: DHT22 Can i share the data pin ?? on: December 09, 2012, 10:01:33 am
Let arduino "read" the sensor and then inform raspberry http://www.doctormonk.com/2012/04/raspberry-pi-and-arduino.html

I think its the best/safe way for me...

Thanks !
12  Using Arduino / Sensors / Re: MQ-2 Gas sensor , how to get sensor value on: December 09, 2012, 09:54:31 am
I was missing the 20k resistor between "Out" pin and GND , now i get value 730-780 when using analogread and >1000 when sensor is detecting a gas ! thanks guys , my bad....
13  Using Arduino / Interfacing w/ Software on the Computer / Re: Usb serial communication with raspberry pi and software serial at the same time on: December 09, 2012, 09:28:09 am
yes you are right i said it because i don't want to power arduino from external power at the same time with a usb cable.. i know it automatically switches but... im new and im afraid.... GND pin of arduino is also required ? i thought external power cable should be enough for arduino...
14  Using Arduino / Interfacing w/ Software on the Computer / Usb serial communication with raspberry pi and software serial at the same time on: December 09, 2012, 12:37:57 am
Hello, i want to connect arduino uno to my raspberry pi , i found a good tutorial here http://www.doctormonk.com/2012/04/raspberry-pi-and-arduino.html and i want to try it.

But before this , i want to know something... I have 2 sensors https://www.sparkfun.com/products/10167? and the reason i want to make the 2 boards to communicate is for sharing the sensors measurements.

I have 2 software serial devices working right now, a gsm shield (pins 2,3) and an lcd (pin 4) , so can i send serial commands from the usb the same time ?

Finally I will use an external power supply of 12V for my arduino , connecting the 2 boards requires a usb cable , what if i use only 2 wires (green white) , the data wires, and cutting red/black (power) wires of the usb cable , it will work ?

Thanks !
15  Using Arduino / Sensors / DHT22 Can i share the data pin ?? on: December 08, 2012, 11:25:12 am
Hello , i want to get measurements from this https://www.sparkfun.com/products/10167? , it works with my arduino , but i want to know if i can share the data pin and connect it to my raspberry pi , in order to read the measurements from there too.... Is that possible ? Does anyone tried it ?
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